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15 November 2000 Clouds and the Earth's Radiant Energy System (CERES) spectral response characterizations
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Spectral Characterizations of the CERES thermistor bolometer is a critical factor in determining precisely the earth's radiant energy budget. CERES bolometers are used in studying the balance between the incoming solar radiation from the sun, the scattered and reflected solar radiation, and the longwave-emitted radiation from the earth. To account for the different frequencies, the CERES instrument contains three thermistor bolometer channels; total channel (0.3 -> 2OO-µm), shortwave channel (0.3 — 5-µm), and window channel (8 — 12-µm). Information on the CERES sensor spectral response is required for their radiometric calibrations. The longwave infrared region (2 - > 2OO-µm) spectral measurements were collected and measured in the TRW Fourier Transform Spectrometer (FTS) vacuum chamber facility. In this paper, in addition to a general review of the concept; the algorithms and procedures are presented which were used to characterize spectrally the sensors' responses. These sensitive modifications are contained both in the shortwave and the longwave regions of the spectral response. Such changes include modifications to the method of analyzing the raw FTS data to produce the longwave region of the spectral response. Other factors which affect the spectral response, such as the Transfer Active Cavity Radiometer's (TACR) calibration data reduction method will also be analyzed.
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Aiman Al-Hajjah, Kory J. Priestley, Susan Thomas, Robert Benjamin Lee III, Bruce R. Barkstrom, Jack Paden, Dhirendra K. Pandey, and Robert S. Wilson "Clouds and the Earth's Radiant Energy System (CERES) spectral response characterizations", Proc. SPIE 4135, Earth Observing Systems V, (15 November 2000);

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